🎉 not all reactors need rotation angles

[shimwell]

Proposed changes

This tiny changes allows Reactors to be build from components and shapes manually without having to set the rotation angle.

Types of changes

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• Bugfix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Code refactoring
• Documentation Update (if none of the other choices apply)
• New tests

Checklist

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• Pep8 applied
• Unit tests pass locally with my changes
• I have added tests that prove my fix is effective or that my feature works
• I have added necessary documentation (if appropriate)

Further comments

If this is a relatively large or complex change, kick off the discussion by explaining why you chose the solution you did and what alternatives you considered, etc...

[codecov]

Codecov Report

Merging #618 (35509b3) into develop (5b7ada0) will increase coverage by 0.25%.
The diff coverage is 100.00%.

@@             Coverage Diff             @@
##           develop     #618      +/-   ##
===========================================
+ Coverage    97.96%   98.21%   +0.25%     
===========================================
  Files           65       65              
  Lines         3628     3986     +358     
===========================================
+ Hits          3554     3915     +361     
+ Misses          74       71       -3     

Impacted Files	Coverage Δ
...metric_neutronics/neutronics_model_from_reactor.py	85.34% <100.00%> (+1.61%)	⬆️
paramak/parametric_components/blanket_fp.py	100.00% <0.00%> (ø)
paramak/parametric_reactors/ball_reactor.py	100.00% <0.00%> (ø)
paramak/parametric_components/hollow_cube.py	100.00% <0.00%> (ø)
paramak/parametric_components/cutting_wedge.py	100.00% <0.00%> (ø)
paramak/parametric_components/vacuum_vessel.py	100.00% <0.00%> (ø)
paramak/parametric_shapes/sweep_mixed_shape.py	100.00% <0.00%> (ø)
paramak/parametric_components/tf_coil_casing.py	100.00% <0.00%> (ø)
paramak/parametric_components/tokamak_plasma.py	100.00% <0.00%> (ø)
paramak/parametric_shapes/rotate_mixed_shape.py	100.00% <0.00%> (ø)
... and 37 more

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